Annex c2 table c 1 limitations of cfast and branzfire

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Table C-1 –Limitations of CFAST and BRANZFIRE S/N Description CFAST BRANZFIRE 1 Maximum simulation time 86,400s[12]2 Maximum number of compartments 30[12]10[16]3 Maximum number of fires which can be included in a single test case (including the main fire) 31[12]4 Maximum number of fire definitions which can be included in a single fire database file 30[12]5 Maximum number of data points for a single main or secondary object fire 21[12]6 Maximum number of material property definitions which can be included in a single thermal database 125[12]7 Maximum number of slabs in a single surface material in the thermal database file 3[12]8 Total number of ducts in all mechanical ventilation systems which can be included in a single test case 60[12]9 Maximum total number of connections between compartments and mechanical ventilation systems which can be included in a single test case 62[12]10 Maximum number of independent mechanical ventilation systems which can be included in a single test case 15[12]11 Maximum number of targets which can be included in a single test case 90[12]12 Maximum number of data points in a history or spreadsheet 900[12]13 Maximum single compartment size 1,200m2 [15]14 Maximum total virtual compartments size 5,000m2 [15]15 Maximum compartment height Ceiling Jet 0.58m to 22m [18]12m[15]16 Maximum compartment volume 60,000m3 [15]17 Maximum length of compartment 25m[4]18 Maximum fire size Ceiling Jet only 0.62MW to 33MW Annex C3

S/N Description CFAST BRANZFIRE 19 Minimum fire size within room of fire origin (This limit is not to be used as a limit to a specific design fire) 0.1 kW/m3 [3]20 Maximum fire size within room of fire origin (This limit is not to be used as a limit to a specific design fire) 1000 kW/m3 [13]21 Maximum ratio of area of vents connecting one compartment to another to the volume of the compartment < 2m-1 [13]22 Corridor Scenario –aspect ratios as follows: * (L/W)max* (L/H)max* (W/H)minL/W > 5[13]L/H > 6[13]W/H < 0.2[13]23 Special consideration for Corridor with use of corridor flow and non-corridor flow algorithm for comparison - aspect ratios as follows: * (L/W)max* (L/H)max* (W/H)min3 <L/W< 5[13]3 <L/H< 6[1230.2<W/H<0.4[13]24 Single Zone compartment scenario –aspect ratios as follows: * (L/W)max* (L/H)max* (W/H)minL/W < 3[13]L/H < 3[13]W/H > 0.4[13]*List not exhaustive (v) List of Approved Zone Models: CFAST BRANZFIRE To seek consensus from SCDF for the use of other zone models (c) Field Models (i) The field model solves fundamental Navier-Stokes equations using numerical method, commonly known as computational fluid dynamics (CFD). It allows study of extremely complicated problems even with irregular and complex geometry. The primary advantage of a field model is that it can provide detailed information on the fluid motions in three-dimensions as compared with zone model (except one-dimensionally). In general, a more powerful computer than desktop personal computer will be required to run CFD.

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